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Apa itu Spring Boot Spring Boot adalah framework berbasis Spring Framework yang mempermudah pembuatan aplikasi Java production-ready dengan: ✅ konfigurasi minimal ✅ embedded server ✅ auto-configuration ✅ siap untuk microservices & cloud 1. Konsep Inti: Dependency Injection (DI) & IoC 🎯 Tujuan Mengurangi coupling antar class. Tanpa DI UserService service = new UserService(); Dengan DI @ Service public class UserService {} @ Autowired UserService service ; Spring container akan membuat & mengelola object. ✔ loose coupling ✔ mudah testing ✔ mudah maintain 2. Auto Configuration Spring Boot otomatis mengkonfigurasi komponen berdasarkan dependency. Contoh: Jika ada dependency: spring-boot-starter-data-jpa Spring otomatis setup: ✔ DataSource ✔ JPA ✔ Transaction manager ➡ developer tidak perlu konfigurasi manual. 3. Starter Dependencies Starter = paket dependency siap pakai. Contoh: spring-boot-starter-web → REST API spring-boot-starter-data-jpa → ...

🧮 Program Purpose This Python program is a simple calculator that allows the user to: ✅ Choose an operation ✅ Enter two numbers ✅ See the calculated result Supported operations: Addition Subtraction Multiplication Division Step-by-Step Explanation: 1. Display the Menu 2. Get User Choice 3. Get Numbers from User 4. Perform Operation Based on Choice Python checks the condition using if-elif-else . Addition Subtraction Multiplication Division Division by Zero Protection 5. Handle Invalid Input Python Code : print("Select operation:") print("1. Addition") print("2. Subtraction") print("3. Multiplication") print("4. Division") choice = input("Enter your choice (1/2/3/4): ") num1 = float(input("Enter first number: ")) num2 = float(input("Enter second number: ")) if choice == '1':     print("Result =", num1 + num2) elif choice == '2':     print("Result =", num1 - num2)...